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Last updated on February 19th, 2025

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109 in Roman Numeral

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Foundation
Intermediate
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The ancient way of writing numbers in roman numerals. Today, we still see numerals in clocks and movie sequels. Here, we focus on the Roman numeral of 109.

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What is 109 in Roman Numerals

Roman numerals use alphabets to represent each number. The roman numeral 109 is CIX, where C is 100 and IX is 9.
 

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Basic rules for CIX in Roman Numeral

  • Addition Method

The values get added when the smaller number follows the larger number.
Example:  LX (60) + III (3) = LXIII (63)
Therefore, 109 in roman numeral is expressed as C (100) + VIX (9) = CIX (109)

 

  • Repetition Method

The repetition method won’t allow the letter to be repeated more than three times.  For example, we can write the roman numeral I repeatedly for 10 times to denote the number 10. For 109, we write a CIX. Where C means 100 and IX is 9

 

  • Subtraction Method

The smaller value is subtracted from the larger number. Example:  5-1 = V - I = IV (4). The number ‘1’ comes after ‘5’ so that I is subtracted from V to get IV (4).

 

  • Limitation Rule

The roman numerals cannot be repeated more than three times. For example, instead of writing ‘IIIIIII’, we write VIII for 8, where V is 5 and III is 3.
 

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How to write CIX in Roman Numeral

There are two methods to write the number in ancient form, roman numerals. The methods are:

 

109 in Roman Numeral by Expansion Method


Here, we break the number into its corresponding place value.

Step 1: We break 109 as 1 in the hundreds place, 0 in the tens place, and 9 in one's place.
Step 2: The numbers in the place value will get converted into roman numerals
Step 3: Join the roman numerals to get the desired number


So, 109 in roman numerals is CIX. Where C is 100 and IX is 9.

 

CIX in Roman Numerals by Grouping Method


The larger roman numeral gets broken into smaller parts.


For CIX,


C → 100
IX → 9


Add (100 + 9)→109
 

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Common Mistakes and How to Avoid Them in CIX

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109 in Roman Numerals Examples

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Problem 1

Simplify (CIX + IX) in roman numerals

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Explanation

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Problem 2

Find M- CIX

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Explanation

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Problem 3

Verify if CIX - IX is C

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Explanation

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FAQs on 109 in Roman Numerals

1.Is 109 even?

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2.What is D in roman numerals?

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3.Is 109 a prime?

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4.Write 666 in roman numerals and in words

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5.What does the Roman numeral CXXXV mean?

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Important Glossaries for CIX in Roman Numeral

  • Roman Numeral: Letter that denotes a number. For example, M denotes 1000

 

  • Grouping Method: Splitting of larger number into smaller sections

 

  • Subtraction Method: Subtracting a letter with low value from a letter with greater value. For example, subtracting X (10) from L (50) to get XL (40)
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Hiralee Lalitkumar Makwana

About the Author

Hiralee Lalitkumar Makwana has almost two years of teaching experience. She is a number ninja as she loves numbers. Her interest in numbers can be seen in the way she cracks math puzzles and hidden patterns.

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: She loves to read number jokes and games.

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